====== USG PG-1C300 Issue 1  ======

**Release Date:** November, 1974\\
**Released By:** UNIX Support Group\\
**Source Code: ** None Available\\
**Documentation: **[[https://www.tuhs.org/Archive/Documentation/TechReports/USG_Library/1040_UNIX_Operating_System_Generic_Program_Issue_1.pdf|UNIX Operating System Generic Program Issue 1]] describes the files comprising the first Issue of USG Program Generic.  This source structure is further described in another [[https://www.tuhs.org/Archive/Documentation/TechReports/USG_Library/1039_Reorganization_of_UNIX_Source_Files.pdf|report]], and the boot process is also [[https://www.tuhs.org/Archive/Documentation/TechReports/USG_Library/1017_Setting_Up_UNIX_Issue_Three.pdf|described]], all in the [[https://www.tuhs.org/Archive/Documentation/TechReports/USG_Library/|USG Library]].

UNIX Program Generic Issue 1, otherwise known as PG-1C300, is a version of the UNIX operating system issued by the UNIX Support Group in November of 1974. The Program Generic line was used as a standard, supported UNIX base on which to base other projects and supply a computing environment to a larger group of users than the Research group could support.

This version appears to be comparable to [[systems:4th_edition|Fourth Edition Unix]], albeit retaining some components from earlier Research versions and incorporating some new features that would show up in later systems of other branches.  In particular, a reorganization of source files was [[https://www.tuhs.org/Archive/Documentation/TechReports/USG_Library/1039_Reorganization_of_UNIX_Source_Files.pdf|undertaken]] upon establishing the Program Generic line.

See Shamim Sharifuddin Pirzada's [[https://www.tuhs.org/Archive/Documentation/Theses/Shamim_Sharfuddin_Pirzada-1988-PhD-Thesis.pdf|A Statistical Examination of The Evolution of the UNIX System]] for more information about the history of USG UNIX.